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Posted by **Adria** on Tuesday, December 8, 2009 at 8:57am.

A. 40

B. 100

C. 75

D. 90

- Statistics -
**Reiny**, Tuesday, December 8, 2009 at 9:58amAccording to

http://davidmlane.com/hyperstat/z_table.html

the probability of a time greater than 13 minutes is .00135

None of your choices result from that probability.

- Statistics -
**PsyDAG**, Tuesday, December 8, 2009 at 10:06amZ = (x - μ)/SD

Z = (13-7)/2 = 6/2 = 3

Look up this Z in a table in the back of your statistics text covering areas under the normal distribution for the smallest area. Multiply this value by 400.

Unfortunately, that does not fit any of your choices. Do you have any typos?

- Statistics -
**Adria**, Tuesday, December 8, 2009 at 12:51pmNo. No typos. That's how its written on the packet I am doing. Thank You so much for your help though, I guess my teacher might've made a typo...

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